From dbbd073f7c5081b5e92b1ba685142ea9ff4faeab Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Thu, 13 Aug 2015 18:20:55 +0700
Subject: Use Itoh-Tsujii inversion (with extended bases for some cases)

---
 crypto/src/math/ec/custom/sec/SecT571FieldElement.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'crypto/src/math/ec/custom/sec/SecT571FieldElement.cs')

diff --git a/crypto/src/math/ec/custom/sec/SecT571FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT571FieldElement.cs
index a26e1e336..5d5458412 100644
--- a/crypto/src/math/ec/custom/sec/SecT571FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecT571FieldElement.cs
@@ -152,8 +152,9 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
 
         public override ECFieldElement Invert()
         {
-            return new SecT571FieldElement(
-                AbstractF2mCurve.Inverse(571, new int[] { 2, 5, 10 }, ToBigInteger()));
+            ulong[] z = Nat576.Create64();
+            SecT571Field.Invert(x, z);
+            return new SecT571FieldElement(z);
         }
 
         public override ECFieldElement Sqrt()
-- 
cgit 1.4.1